Improvement in machines for cutting and bending sheet metal



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JNES R. MAITLAND, 0F LITTLE ROOK, ARKANSAS.

Leners Patent No.114,a11,luted may 2,1811.

IMPROVEMENT IN MACHINES FOR CUTTING AND BENDING SHEEI' METAL.

The Schedule referred to in. these Patent vand making put ci the simo.

To all whom t mm] concern Be it known that I, Jones R. MAITLAND, of Little Rock, in the county of Pulaski and State of Arkansas, have invented a new and improved Machine for Cutting and Bending SheetMetal' Rloong-Plates; and I do hereby declarol that the following is a full. clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part ot this specification, in which- Figure l represents a plan or top View of my improved machine for bending and cutting sheet metal.

.Figure 2 is a vertical longitudinal section of the same taken on the plane of the lineas z, flg. 1.

Figure 3 is a vertical transverse section of the same, taken on the plane of the line y y, 6g. 2.

Figure 4 is a d etal sectional viewoi the 'same taken on the plane of the line z z, g. 1.

Similar letters of reference indicatecorrespouding parte.

This invention relates to a new machine for prepare ing sheetfmetal roofing-plates by properly cutting and bending the same, so that they will, when removed from the machine,l he ready for'use.

The invention consists in a novel arrangement of carriage for supporting the-sheets and conveying them under the cutter and bending-rollers; also in a new vertically-adj ustable cutter-guard, vin the arrangement of .guides for the bending-rollers, of lid for holding the sheet on the carriage, and other minor details, as hereinafter moreihlly described.

A in the drawing represents the frame of my improved bending-machine. It Ais made of wood or other suitable material, of suclr-properform and rsize 'as to iirmly support and hold the devices and mechanism employed thereon.

B isa sliding carriage supported by horizontal dovetail rails a, that extend from front to rear of the machine. The carriage is a plate oi the requisite size, and is held down by the dovetail rails and longitudinally adjustable thereon.

U is a metal lid, hinged to ,the top of the carriage B forholding down the sheet to 4be out. This lid has a shank, b, which may he bent to' properly clear the upward-projecting hack edge of the sheet during the last part of the operation.

0n the back part of the machine are arranged projecting ribs or pieces c c and d, which form the cutterguards, the front guard al being vertically adjustable and connected with a treadle, D, by which it can be drawn down.

A bolt or slide, E, is, by means oil springs e e, forced through apertures of the guard d to lock the same in the upper or lower positions.

Springs h are connected with the treadle b for hold- 4ing .the guard d elevated.

F is the cutter. It is a plate of the size of sheet to be cut, with suspended knives f f at the edges, except in rear, where the sheet was straight when put in. Oblique knives are put in at the corners to clip the corners of the sheet.

1Lhe cutter F is secured to a vertical frame, G, which is connected with a'treadle, H, whereby it is drawn down, springs g holding the same elevated when not used.

I is the main front bending-loller. It is hung with its ends iu the forked'upper end of an upright frame, J, whose lower end is pivoted to thefront part of the treadle H, which is drawn up by a spring, i.

From the frame J project forward eais j j, carrying friction-rollers 7c, which, during the downward motion of the roller I, occasioned by the treadle H, tit against ogee tracks 1, on the frame A, for giving to the bent edge the desired-shape. A similar ear, m., carrying a roller, n, projects from the back of the frame J against a track, O, as shown in iig. 2, and for the same purpose asthe guiding apparatus in iront.

L and L' are rollers for bending the ends of the sheet, they being 4arranged opposite the`ends oi' the carriage. They are respectively hung in frames M M', that are pivoted to treadles N N which are drawn up by springs p.

. The frames M M have inwardly and outwardly pro-v jecting ears q, with rollers rworkin g against the tracks s iu the same manner as the similar devices on the front roller.

t is a vertical arm suspended 'from a transverse wire, u, above the carriage, and provided with a roller, V, at the lower end for holdingdown the lid C.

The operation is as follows:

The treadle H is first moved to draw do'wn the roller I for the admission of the sheet upon the carriage, the latter being on the front part oi' the frame. The end, of the sheet is placed against n. shoulder ot' the carriage provided for that purpose. The carriage is next moved back, but cannot enter under the cut ter as long. as the guard Ad is elevated. The bolt Eis consequently withdrawn from the said guard and the treadle D worked down to lower the guard, when the bolt is released to lock the same iu the lower position. The carriage can now be moved under the cutter.

After the carriage is moved uudcr the cutter the guard d must again be raised, which lsdoue by withdrawing the bolt E bymeansoi'the` springs h. Then the treadle H is depressed for lowering the cutter, which will cut the sheet o1"` the desired shape. The cutter is immediately elevated by thefspriugs g. The carriage is n'ow moved forward again between the `drawn down for bending one endof t l rollers, for which motion the guard d had to be once ready for use.

Having thus described my invention, I claim as n Patentl 1. The sliding carriage B holding the sheet to be ent, herein shown and described.

ew and desire to secure by Letters containing the lid O,- for and bent substantially as neen 2 2. The vertically-adjustable guard d, applied as set 3. The spring-lock E, combined with the adjustable shown and described.

4.,' The rollers I L L', hnng'to pivote@ frames, which have projecting ears for guiding them along enrve'd tracks, substantially as herein shown and described` 5. The combination of the carriage B with the cutter F, rollers I L L', and trendles D, H, Mfcnd M', all arranged to operate substantially as herein shotvn and described. y JONES R. MAITLAN D.

Witnesses:

Taos'. AS. SMITH, BENJ, F. SMITH.

forth, sons to admit and. loek the carriage, as specified.l

guard d, lsubstantially as and for the. purpose herein V' 

